Abstract
We numerically demonstrate that lithium niobate on insulator (LNOI) waveguides may support confined short-wavelength surface acoustic waves that interact strongly with optical fields through backward-stimulated Brillouin scattering in both $Z$- and $X$-cut orientation. We conduct fully anisotropic simulations that consider not only moving boundary and photoelastic forces, but also roto-optic forces for the Brillouin interaction. Our results indicate that photoelasticity dominates the Brillouin gain and can reach as high as ${G_B}/\!{Q_m} = 0.43 \;{{\rm W}^{- 1}}{{\rm m}^{- 1}}$ in standard ridge waveguides.
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